[TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round Sales of E15 Gasoline

[Randall]

Why would it have to be round?

Sure, there are boundary effects and such, but the fuel velocity in the jet is low, reasonably constant, and the same as before.  I would expect the side effects to be reasonably small. A 5% increase in effective opening should get pretty close to 5% more fuel, even if the opening is no longer a ring??
-- Randall

On 7 June 2019 13:40:24 GMT-07:00, Anthony Rhodes <spamiam at comcast.net> wrote:
>Even a file is too aggressive and can't possibly get it round enough
>
>Ideally it would be in a lathe but that is really hard to do
>
>The best way to do it by hand is to chuck it into a drill press and
>spin it. Then use fine sandpaper and remove brass in the desired area
>very gently.  A thousandth of an inch makes a big difference!  You are
>likely looking for around 0.005" removal.  
>
>I suspect that the mixture is a non-linear function of open cross
>section area. As the space between the needle and the jet gets wider, I
>bet the flow gets a lot easier.  There could easily be issues of
>turbulent flow vs laminar flow as the walls get further apart.  
>
>Nevertheless my first approximation assuming a linear function resulted
>in a needle selection that seemed quite good for my engine. 
>
>-Tony
>
>Sent from my 1837 Babbage Analytical Engine
>
>> On Jun 7, 2019, at 2:00 PM, triumphs-request at autox.team.net wrote:
>> 
>> Message: 4
>> Date: Thu, 6 Jun 2019 13:57:42 -0700
>> From: "Randall" <TR3driver at ca.rr.com>
>> To: "'Greg Lemon'" <grglmn at gmail.com>
>> Cc: <triumphs at autox.team.net>, "'Pete Arakelian'"
>>    <Arakelianp at mossmotors.com>
>> Subject: Re: [TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round
>>    Sales of E15 Gasoline
>> Message-ID: <A977DEC0BB084269B41EE85B61224458 at RYPC>
>> Content-Type: text/plain;    charset="us-ascii"
>> 
>> 
>> Those brass needles are really soft; I would suggest a fine tooth
>file and a
>> light touch rather than a Dremel.  I haven't worked out how big the
>flat
>> should be, but it won't take much.  You're only looking for something
>like
>> 5% more fuel (or maybe 6%, depending on whose numbers you believe).
>> 
>> Again assuming you want to run E15 in the first place.
>> 
>> -- Randall
>
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